feat(local-model): one frame for the window, honest figures, a table for the consent

The window is one frame for the whole flow: a fixed height on desktop, App
Settings' boxed close button, the buttons in a foot of their own outside
the part that scrolls, so a click never moves the next button away and
nothing is cut off; the short screens are centred in it on desktop and sit
above the buttons on a phone.

The chooser lists the pick first and then the other models by download
size, largest first, a column the reader can see. A pick that only just
fits says "Best fit, tight". The memory figure is an estimate and says so
once, in whole GB; its legend names the peak, and the installed line uses
the same words beside what the model takes now, so the two figures are not
read as a contradiction. The legend, the column headers and the foot's
promise are set in --text-dim, the bar's track in --text-muted so its free
part can be seen, and only the download figure keeps tabular figures.

The consent screen is the download as a table: the chosen row, the runtime,
the coding agent with its installer's command as the row's second line, the
total in the strong weight, then where it goes in one line. The download bar
means the model download alone and is gone once the model is in; the screen
that ends an install shows "Start a session" alone; an error on an installed
model is the headline with a grey dot; an error's first sentence is the
headline; Remove is quiet everywhere but red in its own question. The
no-recommendation reasons are one sentence each, and the untested note is
in Codeman's voice. A refusal the server names is printed from its sentence.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

src/types/local-model.ts

@@ -351,7 +351,7 @@ export const LOCAL_MODEL_LABELS = {
   headlineLimited:
     'This Mac can run a small model. It handles small edits and questions. It does not replace a cloud model.',
   /** A note under an `ok` or `limited` pick whose `tested` is false. */
-  noteUntested: 'Not yet tested by us on a Mac like this.',
+  noteUntested: 'Codeman has not run this on a Mac like this yet.',
   /** A note under an `ok` pick that is itself a small model: larger ones fit this Mac, but rank lower or have no room on the disk. */
   noteSmallPick:
     'The best fit is a small model. It handles small edits and questions. It does not replace a cloud model.',
@@ -363,18 +363,17 @@ export const LOCAL_MODEL_LABELS = {
   speedSlow: 'Slow',
   speedUnknown: 'Speed unknown',
   noneNotMacos: 'Codeman recommends a local model only on a Mac with Apple silicon.',
-  noneIntel: 'This Mac has an Intel processor. Local coding models need Apple silicon.',
+  noneIntel: 'Local coding models need Apple silicon, and this Mac has an Intel processor.',
   /** Reason `memory`: nothing fits at any context. */
-  noneMemory:
-    'This Mac has {memory} GB of memory. That is too little to run a model that can drive a coding agent, so Codeman recommends none here.',
-  /** Reason `memory`: a model fits, but only below the context a harness needs. Says both numbers, and that they are an estimate. */
+  noneMemory: 'With {memory} GB of memory, this Mac cannot run a model that can drive a coding agent.',
+  /** Reason `memory`: a model fits, but only below the context a harness needs. Says both numbers, and ("about") that they are estimates. */
   noneMemoryContext:
-    'Codeman estimates that this Mac can give a model about {budget} GB of memory. The smallest model a coding agent can work with needs about {need} GB. That leaves no safe margin, so Codeman recommends none here.',
+    'This Mac can give a model about {budget} GB of memory, and the smallest model a coding agent can work with needs about {need} GB.',
   /** Reason `memory`: the memory size could not be read, so no size is stated. */
   noneMemoryUnknown: 'Codeman could not read how much memory this Mac has, so it recommends no model here.',
-  noneDisk:
-    'Not enough free disk space. The smallest model that fits this Mac is a {download} GB download, and {reserve} GB must stay free after it. {free} GB is free now. Free up about {missing} GB.',
-  noneMacos: 'This Mac runs macOS {version}. Local models need macOS {minimum} or newer.',
+  /** Reason `disk`. One number: what to do. The other sizes travel in `vars` for a client that wants them. */
+  noneDisk: 'Free up about {missing} GB of disk space to install the smallest model that fits this Mac.',
+  noneMacos: 'Local models need macOS {minimum} or newer, and this Mac runs macOS {version}.',
   noneNoHarness: 'No coding agent that Codeman can connect to a local model is available on this Mac.',
 } as const;
 
@@ -401,14 +400,17 @@ export interface LocalModelMessage {
 /**
  * The one tag a model row of the chooser carries, by what it says.
  *  - `tested`: `Candidate.tested` is true. Replaces every other tag.
- *  - `best`: the pick. The one tag drawn in the accent colour.
+ *  - `best-tight`: the pick, when its `fit` is `tight`. The words must not say less than the
+ *    memory bar beside them, which is nearly full for such a row.
+ *  - `best`: the pick.
  *  - `tight`: `Candidate.fit` is `tight`.
  *  - `slow`: `Candidate.speed` is `slow`.
  *  - `small`: the model has fewer than 12 billion parameters.
- * A row gets the FIRST kind of this list that applies and no tag when none does, so a pick
- * that is tight says "Best fit" (the memory bar already shows how full it is).
+ * A row gets the FIRST kind of this list that applies and no tag when none does. `tested`,
+ * `best` and `best-tight` are the tags of the row the window opens on, drawn in the accent
+ * colour.
  */
-export type CandidateTagKind = 'tested' | 'best' | 'tight' | 'slow' | 'small';
+export type CandidateTagKind = 'tested' | 'best-tight' | 'best' | 'tight' | 'slow' | 'small';
 
 /**
  * The text of each tag, in English (the i18n source language), like `LOCAL_MODEL_LABELS`. A
@@ -416,6 +418,7 @@ export type CandidateTagKind = 'tested' | 'best' | 'tight' | 'slow' | 'small';
  */
 export const LOCAL_MODEL_TAG_LABELS = {
   tested: 'Tested on a Mac like this',
+  'best-tight': 'Best fit, tight',
   best: 'Best fit',
   tight: 'Tight',
   slow: 'Slow',