docs: fix Microsoft.UIVerbs findings (click -> select)

Part of #4041's forgotten remainder (UIVerbs was scoped as pure
execution work, no decision needed -- see comment 71586).

29 genuine input-device-neutral rewrites ("click"/"clicking"/"clicked"
-> "select"/"selecting"/"selected", a few reworded where a direct verb
swap didn't read naturally: "one click from the hub" -> "one step from
the hub", "click straight from X into Y" -> "go straight from X into
Y", "the operator never clicked" -> "the operator never triggered").

Left 5 hits unfixed, each read in context and genuinely not a
device-assumption problem:
- docs/process/gotchas.md:439 -- "click-to-unlock screen" names a
  specific OS lock-screen pattern, not an instruction to the reader.
- docs/web-ui/agent.md:377 -- "clicks" describes literal RFB pointer
  events forwarded by hive-screen-mcp's sendPointer, genuinely
  mouse-specific.
- docs/web-ui/agent.md:78 -- "ctrl/middle-click" names a specific
  keyboard-modifier + mouse-button combination with no "select"
  equivalent.
- docs/web-ui/dashboard.md:741 -- explicitly contrasts "click (or
  Enter/Space)" as two named input methods; replacing "click" with
  "select" would conflate the two the sentence is distinguishing.
- docs/web-ui/shape.md:253 -- "swipes in from the right" describes the
  panel's own slide animation, not a user touch gesture.

Verified: fresh `vale --filter '.Name == "Microsoft.UIVerbs"' docs`
after the fix shows exactly those 5, `nix fmt` reports 0 changes.

docs/web-ui/agent.md

@@ -52,7 +52,7 @@ structurally rather than for one specific trigger. Two columns:
     `◌ needs login` / `◌ logging in` / `○ offline` / `… connecting`.
   - **State badge**: `💤 idle` / `🧠 thinking` / `📦 compacting` /
     `○ offline` / `… booting` + age suffix.
-  - **Model badge** (`model · <name> ▾`): a real picker — click opens
+  - **Model badge** (`model · <name> ▾`): a real picker — selecting it opens
     a `Dropdown` of `state.available_models`, selecting one POSTs
     `/api/model` immediately (same endpoint the `/model <name>` slash
     command uses). No longer buried in the overflow menu — the design
@@ -68,7 +68,7 @@ structurally rather than for one specific trigger. Two columns:
     endpoints the dashboard uses (pausing needs a write this
     unprivileged process can't make directly).
   - **Inbox / todos pills** (`📬 inbox · N` / `📋 todos · N`): hidden
-    when empty; click opens the matching flyout in the side panel.
+    when empty; selecting it opens the matching flyout in the side panel.
   - **Links badge** (`🔗`): opens a popover listing `↑ dashboard`
     (back-link to the host dashboard, `${dashboardBase}dashboard.html`)
     followed by this agent's `agent_links()`-sourced navigation (stats,
@@ -152,7 +152,7 @@ via the header pills) as well as long content (file previews, diffs,
 journald logs). Inbox flyout: unread messages addressed to this agent
 (`acked_at IS NULL`, newest-first, up to 30); reply messages indented
 with `↳ reply ·` in amber. A `✓ mark all read` button appears in the
-flyout header when the inbox is non-empty; clicking it confirms then
+flyout header when the inbox is non-empty; selecting it confirms then
 POSTs cross-origin to the core dashboard's `POST
 /api/agent/{name}/mark-all-read` — all pending messages for this agent
 are acked, the harness won't receive wake-prompts for them. A `{
@@ -212,7 +212,7 @@ the full row taxonomy and dispatch logic):
     operator: "..."`, etc.): flat one-line per-tool format with
     per-tool salient-arg extraction (`fmtToolUse`).
 - `Stream` `tool_result` short → flat `← ...`; long → collapsed
-  `<details>` `▸ ← Nl · headline` (click to expand full body).
+  `<details>` `▸ ← Nl · headline` (select to expand full body).
 - `Stream` `thinking` → `.thinking` row with a `💭 thinking …`
   indicator.
 - `Stream` `system` → handled by subtype: `plugin_install` and